Torque Converter Lock-Up Will Not Release
WARNING: This page is about a different car, the 2003 Toyota RAV4, 2002 Toyota RAV4, 2002 Toyota Highlander, 2001 Toyota RAV4, and 2001 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
Check shift solenoid valve SL circuit, TP sensor circuit, brakelight circuit, ECM circuit, lock-up relay valve and torque converter clutch.